A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic-resistant strain of the bacteria becomes prevalent. Which mechanism explains this phenomenon?

Ludwig Boltzmann developed a model that relates entropy to: Select the correct answer below: a. the spontaneous heat flow accompanying a process to the temperature at which the process takes place b.

A metal lid on a jar may loosen when it has been held in hot water because the hot water causes the A. glass jar to contract B. metal lid to contract C. glass jar to expand more than the metal lid D. metal lid to expand more than the glass jar

Complete the following analogy. Homogeneous is to soluble particles as heterogeneous is to A. solute particles. B. solvent particles. C. insoluble particles.

According to the scale, which of these substances is the strongest acid?

A 21.5 g piece of iron at 100.0∘C is dropped into 132 g of water at 20.0∘C. What is the final temperature of the system, in degrees Celsius, if the specific heat of iron is 0.449Jg∘C? Round your answer to one decimal place. Use 4.

Electrolysis of 10.0 g of a binary metal chloride deposits 6.207 g of the pure metal. what is the metal?

Which pair of elements are the most different

A gas held at constant volume is heated from - 5 ºC to 50 ºC, if the initial pressure is 1.0 atm, what is the new pressure the gas exerts?

Unknown element x is a metal that ionically bonds to sulfur. is the formula, x3s feasible? why or why not? a) it is feasible. the three metallic ions each receive an electron from sulfur. b) no, it is not feasible.

What is the difference between a period and a group on the periodic table